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<title>X509_get_serialNumber</title>
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<ul id="index">
  <li><a href="#NAME">NAME</a></li>
  <li><a href="#SYNOPSIS">SYNOPSIS</a></li>
  <li><a href="#DESCRIPTION">DESCRIPTION</a></li>
  <li><a href="#RETURN-VALUES">RETURN VALUES</a></li>
  <li><a href="#SEE-ALSO">SEE ALSO</a></li>
  <li><a href="#HISTORY">HISTORY</a></li>
  <li><a href="#COPYRIGHT">COPYRIGHT</a></li>
</ul>

<h1 id="NAME">NAME</h1>

<p>X509_get_serialNumber, X509_get0_serialNumber, X509_set_serialNumber, X509_ACERT_get0_serialNumber, X509_ACERT_set1_serialNumber - get or set certificate serial number</p>

<h1 id="SYNOPSIS">SYNOPSIS</h1>

<pre><code>#include &lt;openssl/x509.h&gt;

ASN1_INTEGER *X509_get_serialNumber(X509 *x);
const ASN1_INTEGER *X509_get0_serialNumber(const X509 *x);
int X509_set_serialNumber(X509 *x, ASN1_INTEGER *serial);

#include &lt;openssl/x509_acert.h&gt;

ASN1_INTEGER *X509_ACERT_get0_serialNumber(X509_ACERT *x);
int X509_ACERT_set1_serialNumber(X509_ACERT *x, ASN1_INTEGER *serial);</code></pre>

<h1 id="DESCRIPTION">DESCRIPTION</h1>

<p>X509_get_serialNumber() returns the serial number of certificate <b>x</b> as an <b>ASN1_INTEGER</b> structure which can be examined or initialised. The value returned is an internal pointer which <b>MUST NOT</b> be freed up after the call.</p>

<p>X509_get0_serialNumber() is the same as X509_get_serialNumber() except it accepts a const parameter and returns a const result.</p>

<p>X509_set_serialNumber() sets the serial number of certificate <b>x</b> to <b>serial</b>. A copy of the serial number is used internally so <b>serial</b> should be freed up after use.</p>

<p>X509_ACERT_get0_serialNumber() performs the same operation as X509_get_serialNumber() for attribute certificates.</p>

<p>X509_ACERT_set1_serialNumber() performs the same operation as X509_set_serialNumber() for attribute certificates.</p>

<h1 id="RETURN-VALUES">RETURN VALUES</h1>

<p>X509_get_serialNumber(), X509_get0_serialNumber() and X509_ACERT_get0_serialNumber() return a pointer to an <b>ASN1_INTEGER</b> structure.</p>

<p>X509_set_serialNumber() and X509_ACERT_set1_serialNumber() return 1 for success and 0 for failure.</p>

<h1 id="SEE-ALSO">SEE ALSO</h1>

<p><a href="../man3/d2i_X509.html">d2i_X509(3)</a>, <a href="../man3/ERR_get_error.html">ERR_get_error(3)</a>, <a href="../man3/X509_CRL_get0_by_serial.html">X509_CRL_get0_by_serial(3)</a>, <a href="../man3/X509_get0_signature.html">X509_get0_signature(3)</a>, <a href="../man3/X509_get_ext_d2i.html">X509_get_ext_d2i(3)</a>, <a href="../man3/X509_get_extension_flags.html">X509_get_extension_flags(3)</a>, <a href="../man3/X509_get_pubkey.html">X509_get_pubkey(3)</a>, <a href="../man3/X509_get_subject_name.html">X509_get_subject_name(3)</a>, <a href="../man3/X509_NAME_add_entry_by_txt.html">X509_NAME_add_entry_by_txt(3)</a>, <a href="../man3/X509_NAME_ENTRY_get_object.html">X509_NAME_ENTRY_get_object(3)</a>, <a href="../man3/X509_NAME_get_index_by_NID.html">X509_NAME_get_index_by_NID(3)</a>, <a href="../man3/X509_NAME_print_ex.html">X509_NAME_print_ex(3)</a>, <a href="../man3/X509_new.html">X509_new(3)</a>, <a href="../man3/X509_sign.html">X509_sign(3)</a>, <a href="../man3/X509V3_get_d2i.html">X509V3_get_d2i(3)</a>, <a href="../man3/X509_verify_cert.html">X509_verify_cert(3)</a></p>

<h1 id="HISTORY">HISTORY</h1>

<p>The X509_get_serialNumber() and X509_set_serialNumber() functions are available in all versions of OpenSSL. The X509_get0_serialNumber() function was added in OpenSSL 1.1.0. The X509_ACERT_get0_serialNumber() and X509_ACERT_set1_serialNumber() functions were added in OpenSSL 3.4.</p>

<h1 id="COPYRIGHT">COPYRIGHT</h1>

<p>Copyright 2016-2024 The OpenSSL Project Authors. All Rights Reserved.</p>

<p>Licensed under the Apache License 2.0 (the &quot;License&quot;). You may not use this file except in compliance with the License. You can obtain a copy in the file LICENSE in the source distribution or at <a href="https://www.openssl.org/source/license.html">https://www.openssl.org/source/license.html</a>.</p>


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